#!/usr/bin/bash

if [ $(/usr/bin/id -u) != 0 ]; then echo "only root can do that"; exit 2; fi

#***************************************************************************
# This file is part of the CRYPTO BONE
# File     : getlocalsecret
# Version  : 2.0 (ALL-IN-ONE)
# License  : BSD-3-Clause
# Date     : 24 May 2025 
# Contact  : Please send enquiries and bug-reports to innovation@senderek.ie
#
#
# Copyright (c) 2015-2025
#	Ralf Senderek, Ireland.  All rights reserved. (https://senderek.ie)
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# 1. Redistributions of source code must retain the above copyright
#    notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
#    notice, this list of conditions and the following disclaimer in the
#    documentation and/or other materials provided with the distribution.
# 3. All advertising materials mentioning features or use of this software
#    must display the following acknowledgement:
#	   This product includes software developed by Ralf Senderek.
#
# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND  ANY EXPRESS OR 
# IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE  IMPLIED WARRANTIES 
# OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  
# IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 
# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 
# PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 
# OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 
# WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 
# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 
# POSSIBILITY OF SUCH DAMAGE.
#
#****************************************************************************

# The local.key file is protected by file permissions "-rw------- root"
# But it can be removed from the file system and be stored on a removable
# USB medium which must be inserted every time the cryptobone is being used.
# Without the local.key information the cryptobone daemon can not be accessed.

     if [ -L /usr/lib/cryptobone/ALLINONE ]
     then
          # All-In-One
	  if [ -f /usr/lib/cryptobone/keys/local.key ]
	  then
               /bin/cat /usr/lib/cryptobone/keys/local.key
               exit 0
          else
	       # check USB media
	       for DEV in $(df | cut -f1 -d" "| grep /dev)
	       do
	            DIR=$(df $DEV | tail -1)
		    FILE=${DIR##* }/local.key
		    if [ -f $FILE ]
		    then
		         TEST=$(sha256sum $FILE | cut -f1 -d" ")
		         HASH=$(cat /usr/lib/cryptobone/keys/local.key.sha256 2>/dev/null)
		         
			 if [ x$TEST =  x$HASH ]
		         then
		              cat $FILE 
			      exit 0
		         fi
		    fi    
	       done  

          fi
     else
          # real Crypto Bone
	  if [ -f /usr/lib/cryptobone/keys/EXTERN.local.key ]
	  then
               /bin/cat /usr/lib/cryptobone/keys/EXTERN.local.key
               exit 0
          else
	       # check USB media
	       for DEV in $(df | cut -f1 -d" "| grep /dev)
	       do
	            DIR=$(df $DEV | tail -1)
		    FILE=${DIR##* }/cryptobone.local.key
		    if [ -f $FILE ]
		    then
		         TEST=$(sha256sum $FILE | cut -f1 -d" ")
		         HASH=$(cat /usr/lib/cryptobone/keys/local.key.sha256)
		         
			 if [ $TEST =  $HASH ]
		         then
		              cat $FILE 
			      exit 0
		         fi
		    fi    
	       done  

	  fi     
     fi

echo "no localkey available"
exit 1

#-------------------------------------------------------------------#